Measuring quality of life of patients with axial spondyloarthritis for economic evaluation oleh Désirée van der Heijde, Pedro M Machado, Roberta Ramonda, Maura C Couto, Helena Santos, Floris A van Gaalen, Karen Minde Fagerli, Miguel Bernardes, Pedro D Carvalho, Sofia Exarchou, Allan Wailoo, Monica Hernandez Alava, Georgios Chrysanthou, Filipe Barcelos, Laura Gago, Maria Margarida Cunha, Marleen van de Sande